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Longevity science, explained
Evidence-based articles on sleep, nutrition, skin aging, cognitive health, and the science of living longer, better.
Skin Longevity
37 articlesSkin Longevity
The Biology of Skin Aging: What Happens Inside Your Skin as You Age?
Skin from people over 80 has roughly 35% fewer collagen-producing fibroblasts than skin from people in their 20s — and a growing share of the cells that remain become "senescent," actively degrading nearby tissue rather than just declining. The cellular biology behind skin aging, and why it's genuinely modifiable.
Skin Longevity
How Fast Does Your Skin Actually Age?
A landmark twin study found up to 40% of visible facial ageing comes down to non-genetic, environmental factors — and smoking twins were perceived as roughly 2.5 years older per decade smoked than their non-smoking twin. How fast skin actually ages, and how much of it you control.
Skin Longevity
Collagen Loss With Age: When Does It Start and How Fast Does It Happen?
Collagen production begins declining roughly 1-1.5% a year starting in your mid-to-late 20s — then menopause can trigger a loss of up to 30% in just five years. The actual, quantified research on when collagen loss starts and why it compounds.
Skin Longevity
Photoaging vs Natural Aging: Why They Are Not the Same
An estimated 80% of visible facial skin ageing is attributable to UV exposure, not the simple passage of time — and a famous 2012 medical case showed a truck driver whose sun-exposed side looked two decades older than the other. Why photoaging and natural ageing are mechanistically distinct, and why one is largely preventable.
Skin Longevity
UVA vs UVB: Which One Actually Ages Your Skin?
UVA makes up 90-95% of UV radiation reaching Earth's surface and stays constant across seasons and cloud cover — while UVB, though far more potent per unit at causing DNA damage, is actually the smaller, more variable share. Why "UVA ages, UVB burns" is useful but incomplete.
Skin Longevity
PA++++, UVA-PF & Broad-Spectrum: Understanding Sunscreen Labels
SPF measures UVB protection only — it says nothing about UVA, the wavelength responsible for most photoaging. How to actually read "Broad Spectrum," PA ratings, and UVA-PF so you can choose a sunscreen that protects against both types of damage.
Skin Longevity
Botulinum Toxin: More Than Just Wrinkles?
Botulinum toxin works by cleaving SNAP-25, the same molecular target "topical Botox" peptides claim to affect — but with decades of confirmed clinical evidence behind it. How it actually works, and the surprisingly broad range of medical uses built on the same mechanism as its cosmetic application.
Skin Longevity
Chemical Exfoliation: AHAs, BHAs & PHAs Explained
AHAs are water-soluble and work at the skin's surface; BHAs are oil-soluble and can penetrate into sebum-filled pores — a fundamental difference that determines which acid suits which skin concern. A clear breakdown of AHAs, BHAs, and PHAs, and how to actually choose between them.
Skin Longevity
Diet and Skin: What You Eat and How It Shows Up on Your Skin
A meta-analysis of 78,529 children, adolescents, and young adults found a consistent association between dairy intake — particularly skim milk — and acne risk, working through the same insulin/IGF-1 pathway as high-glycemic diets. How diet connects to nearly every mechanism covered across this series.
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